Tunnel-yoke for cable railways



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C. A. MARSHALL. l

TUNNEL YOKB FOR CABLBRAILWAYS.

10.402,533. Patented Apr. 3o, 1889.

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, 3 shows a section taken atthe line J J through Fig. 5 shows inperspective the UNITED STATES PATENT OFFICE.

CHARLES A. MARSHALL, OF JOHNSTOWN, PENNSYLVANIA, ASSIGNOR TO THE JOHNSONCOMPANY, OF KENTUCKY.

TUNNEL-YOKE FOR CABLE RAILWAYS.

SPECIFICATION forming part of Letters Patent No. 402,533, dated April.30, 1889.

Application led October 21, 1887. Serial No. 252,956. (No model.)

To all whom it may concern:

Beit known that I, CHARLES A. MARSHALL, of Johnstown, in the county ofCambrial and State of Pennsylvania, have invented a new and usefulChannel-Yoke for the Tunnels of Cable Railways, which invention is fullyset forth andl illustrated in the following specification andaccompanying drawings.

`The object of this invention is to make strong and durable built-upyokes for the tunnels of cable railways, which yokes shall combine greatstrength with a minimum weight of metal.

The invention will first be described in detniil, and then fully setforth in the claim.

In the accompanying drawings, Figure l illustrates in front elevationone type or form of built-up yoke.V Fig. 2 shows a side elevation ofFig. 1,looking to the left, the slotrail S and track-rail F beingomitted. Fig.

Fig. l. Fig. 4 shows a section taken at the line K K through Fig. l,looking to the right.

yoke illustrated geometrically in Fig. l.

In said figures the several parts are indi-y cated by letters, as belowdescribed.

The whole Astructure in the several ligures being entirely composed ofangle metal and plate metal, the interior angles are indicated by theletter A and the exterior angles by the letter B. The arms forsupporting the trackrails are indicated by the letter b.

The letters C C indicate plates which form the lower web portions of thestructure, and D D the bottom angle pieces or stiffeners.

E E indicate re-enforcing plates, which, by lapping the lowerweb-plates, C, and upper web-plates, G, at their joints, strengthen saidjoints. l

F indicates a Tbar support for the trackrails, which may be of anydesired type or form of rail, two different forms being shown, asvindicated by the letter F.

H, Fig. l, indicates another form of chair or rail-support for therailF, thereon mounted, devoid of lower ange. Any type of chair or otherrail-suppport may be used, as such sup ports form no part of thisinvent-ion.

The letters S S indicate the slot-rails, which 5o may be made of anydesired form suitable for the purpose, the slot for the passage of thecable-grip being indicated by the space shown between said slot-rails.

In types of yoke shown in Figs. l and 5, respectively, it will beobserved that the channel form is preserved throughout, whichconstruction imparts great strength to said struct= ures. It is obviousthat instead of anglepieces T-bars may be used; but in such case 6o itis also obvious that the costof the structure will be much increased.

Practical tests have demonstrated that a structure such as illustratedin Fig. l is about as rigid or offers as great resistance to the o5closing of the slot for the passage of the cablegrip as can be made witha given weight 0f metal. It will thus be observed that, with theexception of such pointsas those at which the bottom binders, D D,overlap the two side 7o structures, C G, the shape of the sectionofmetal preserved is that of achannel. That portion of the bottombinders which gives the measure of their whole strength is through thevertical line oc oc. In this, also, is the channel form preserved, sothat the measure of the stiffness of the yoke throughout is that of achannel-section, the only point where said section is not preservedbeing that wherein the bottom binders overlap the side members 8o forpurposes of construction. l

Having thus fully described my said invention of yokes for cablerailways, I claim- A built-up yoke for the tunnels of cable railwaysconstructed entirely of angle metal Y and plate metal, so that said yokepresents a channel-section viewed either through its side walls orthrough the center of its bottom binders orbrace, substantially as setforth.

CHAS. A. MARSHALL.

Witnesses: E. B. EN'rwIsLn,

W. MCLAIN.

